CN201765373U - Pickup lens and pickup device as well as convenient terminal unit - Google Patents
Pickup lens and pickup device as well as convenient terminal unit Download PDFInfo
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- CN201765373U CN201765373U CN2010202453037U CN201020245303U CN201765373U CN 201765373 U CN201765373 U CN 201765373U CN 2010202453037 U CN2010202453037 U CN 2010202453037U CN 201020245303 U CN201020245303 U CN 201020245303U CN 201765373 U CN201765373 U CN 201765373U
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/004—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having four lenses
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
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Abstract
The utility model provides a pickup lens capable of shortening a total length and realizing high imaging performances, a pickup device capable of obtaining high-resolution pickup signals by carrying the pickup lens as well as a convenient terminal unit. The pickup lens is provided with a first lens (G1) provided with positive refraction force, a second lens (G2) provided with negative refraction force, a third lens (G3) provided with positive refraction force and a fourth lens (G4) the surface of which at an object side is a concave surface or a plane near an optical axis and sequentially provided with negative refraction force from the object side; moreover, the pickup lens satisfies the following conditional expression: (R4 plus R3) divided by (R4 minus R3) is more than 0.3 and is less than 1.5...(1); wherein R3 is set as the paraxial curvature radius of the surface of the second lens (G2) at the object side; and R4 is set as the paraxial curvature radius of the surface of the second lens (G2) at an image side.
Description
Technical field
The present invention relates to a kind of optical image that makes subject and image in imaging lens system on CCD (Charge CoupledDevice) or the CMOS imaging apparatuss such as (Complementary Metal Oxide Semiconductor), and the camera head by carrying digital static video camera that this imaging lens system takes etc. and the mobile phone or the information portable terminal device portable terminal devices such as (PDA:Personal Digital Assistance) of band video camera.
Background technology
In recent years, along with personal computer to the popularizing of general family etc., the digital static video camera (カ メ ラ) that image informations such as the landscape taken or bust can be input to personal computer is popularized fast.And, also increase gradually in the situation of mobile phone lift-launch image input with camara module.In having the equipment of this camera function, use imaging apparatuss such as CCD or CMOS.In recent years, the development of the densification of these imaging apparatuss, imaging lens system whole to picture pick-up device and that carried also requires compactedness.And the high pixelation of imaging apparatus also develops simultaneously, requires high-resolution, the high performance of imaging lens system.
In patent documentation 1～6, disclose by 3 or 4 imaging lens systems that lens constitute.Put down in writing as these documents, especially as the imaging lens system of 4 chip architectures known have employing positive and negative successively from the thing side, just, the structure of positive power configuration or adopt structure from positive and negative, the positive and negative successively power configuration of thing side.In the situation of the imaging lens system of this 4 chip architectures, be that the situation of convex form is more near the face of paraxial (optical axis) its thing side by the lens of shooting side.On the other hand, in the embodiment 5,9 of patent documentation 2, disclose under positive and negative, the positive and negative power configuration the face by near the thing side the optical axis of the lens of shooting side be shaped as recessed structure.
Patent documentation 1: No. 3424030 communiques of Jap.P.
Patent documentation 2: the open 2007-017984 communique of Jap.P.
Patent documentation 3: the open 2007-122007 communique of Jap.P.
Patent documentation 4: the open 2007-219079 communique of Jap.P.
Patent documentation 5: the open 2008-268946 communique of Jap.P.
Patent documentation 6: the open 2009-020182 communique of Jap.P.
The miniaturization of imaging apparatus in recent years and high pixelation develop as mentioned above.Especially portable with in the imaging lens system of camara module, major requirement cost aspect and compactedness in the past, but recently in the portable trend that the high pixelation development of imaging apparatus is also arranged in camara module, to the also progressively raising of requirement of aspect of performance.Therefore, the exploitation of the diversified lens of cost aspect, aspect of performance and compactedness is taken all factors into consideration in expectation, and the exploitation of the visual field, low-cost and high performance imaging lens system will be also put in expectation to the lift-launch of Digital Video on aspect of performance.In the lens of above-mentioned each patent documentation record, for example take into account imaging performance and compactedness aspect insufficient.And,, not talkative each structure example has been examined optimal condition fully though disclose the imaging lens system of 4 chip architectures of multiple kind at patent documentation 2.
In addition, the present application is the utilization invention of the invention put down in writing of patent documentation 6.The imaging lens system that patent documentation 6 is put down in writing has been considered the balance of further miniaturization and performance, and its result can solve the problem of the present application.
Summary of the invention
The present invention makes in view of these problem points, its purpose is, a kind of imaging lens system that can realize the cripeturaization of length overall and realize high imaging performance is provided, reaches by carrying camera head and the portable terminal device that this imaging lens system can access high-resolution image pickup signal.
Based on imaging lens system of the present invention, comprise successively from the thing side: the 1st lens have positive refracting power; The 2nd lens have negative refracting power; The 3rd lens have positive refracting power; The 4th lens, the face of thing side are concave surface or plane near optical axis, and have negative refracting power near optical axis.
And formula meets the following conditions.Wherein, R3 paraxial radius-of-curvature, the R4 of face that be made as the thing side of the 2nd lens is made as the paraxial radius-of-curvature of face of the picture side of the 2nd lens.
0.3＜|(R4+R3)/(R4-R3)|＜1.5……(1)
In based on imaging lens system of the present invention, on the whole in 4 the structure, obtain lens combination to the favourable and high imaging performance of the shorteningization of length overall by the optimization of seeking each lens arrangement.Especially seek the optimization of the structure of the 2nd lens by the formula of satisfying condition (1).In imaging lens system of the present invention, employing will be set as concave surface or plane and the structure favourable to the shorteningization of length overall by near the face shape of the thing side the optical axis of the lens (the 4th lens) of shooting side.
And, by further suitably adopting and satisfying following preferred construction, seek the shorteningization of length overall easily, and seek more high performance.
Be preferably based on imaging lens system of the present invention and satisfy at least 1 following conditional.
0.3＜|f4/f|＜0.80……(2)
0.4＜f1/f＜1.1……(3)
0.2＜f3/f＜1.6……(4)
0.5＜|f2/f|＜2.0……(5)
20＜v1-v2……(6)
Wherein, f is made as the focal length that focal length, f4 that focal length, f3 that focal length, f2 that whole focal length, f1 be made as the 1st lens be made as the 2nd lens be made as the 3rd lens are made as the 4th lens.V1 is made as the 1st lens Abbe number, the v2 of d line is made as the Abbe number of the 2nd lens to the d line.
And in based on imaging lens system of the present invention, preferred diaphragm more disposes by the thing side than the vertex of surface position of the picture side of the 1st lens.
In based on imaging lens system of the present invention, preferred the 1st lens, the 2nd lens, the 3rd lens and the 4th lens two sides separately are aspherical shape.
Especially, preferred the 4th lens as the face of side near the optical axis for concave shape and have along with comparing the zone that dies down towards near the negative refracting power of periphery and the optical axis.
Possess based on camera head of the present invention: the imaging apparatus of the pairing image pickup signal output of optical image that forms based on imaging lens system of the present invention with this imaging lens system.
Possess based on portable terminal device of the present invention: based on camera head of the present invention and indication mechanism that the captured image of this camera head is shown.
In based on camera head of the present invention or portable terminal device,, can obtain high-resolution image pickup signal according to by the resulting high-resolution optical image of imaging lens system of the present invention.
According to imaging lens system of the present invention, on the whole in 4 the lens arrangement, because the shape of each lens is able to suitably optimization etc., so can realize the shorteningization of length overall and realize high imaging performance.
And, according to camera head of the present invention or portable terminal device, owing to be set as the image pickup signal of the optical image that output forms corresponding to the imaging lens system by the high imaging performance with the invention described above, so can obtain high-resolution photographs.
Description of drawings
Fig. 1 is the figure of the 1st structure example of the related imaging lens system of expression one embodiment of the present invention, is the lens cut-open view corresponding to numerical value embodiment 1.
Fig. 2 is the figure of the 2nd structure example of expression imaging lens system, is the lens cut-open view corresponding to numerical value embodiment 2.
Fig. 3 is the figure of the 3rd structure example of expression imaging lens system, is the lens cut-open view corresponding to numerical value embodiment 3.
Fig. 4 is the figure of the 4th structure example of expression imaging lens system, is the lens cut-open view corresponding to numerical value embodiment 4.
Fig. 5 is the figure of the 5th structure example of expression imaging lens system, is the lens cut-open view corresponding to numerical value embodiment 5.
Fig. 6 is the figure of the 6th structure example of expression imaging lens system, is the lens cut-open view corresponding to numerical value embodiment 6.
Fig. 7 is the figure of the 7th structure example of expression imaging lens system, is the lens cut-open view corresponding to numerical value embodiment 7.
Fig. 8 is the figure of the 8th structure example of expression imaging lens system, is the lens cut-open view corresponding to numerical value embodiment 8.
Fig. 9 is the figure of the 9th structure example of expression imaging lens system, is the lens cut-open view corresponding to numerical value embodiment 9.
Figure 10 is the figure of the 10th structure example of expression imaging lens system, is the lens cut-open view corresponding to numerical value embodiment 10.
Figure 11 is the figure of the 11st structure example of expression imaging lens system, is the lens cut-open view corresponding to numerical value embodiment 11.
Figure 12 is the aberration diagram of the various aberrations of the related imaging lens system of expression embodiment 1, and (A) expression spherical aberration, (B) expression astigmatism, (C) represents to distort.
Figure 13 is the aberration diagram of the various aberrations of the related imaging lens system of expression embodiment 2, and (A) expression spherical aberration, (B) expression astigmatism, (C) represents to distort.
Figure 14 is the aberration diagram of the various aberrations of the related imaging lens system of expression embodiment 3, and (A) expression spherical aberration, (B) expression astigmatism, (C) represents to distort.
Figure 15 is the aberration diagram of the various aberrations of the related imaging lens system of expression embodiment 4, and (A) expression spherical aberration, (B) expression astigmatism, (C) represents to distort.
Figure 16 is the aberration diagram of the various aberrations of the related imaging lens system of expression embodiment 5, and (A) expression spherical aberration, (B) expression astigmatism, (C) represents to distort.
Figure 17 is the aberration diagram of the various aberrations of the related imaging lens system of expression embodiment 6, and (A) expression spherical aberration, (B) expression astigmatism, (C) represents to distort.
Figure 18 is the aberration diagram of the various aberrations of the related imaging lens system of expression embodiment 7, and (A) expression spherical aberration, (B) expression astigmatism, (C) represents to distort.
Figure 19 is the aberration diagram of the various aberrations of the related imaging lens system of expression embodiment 8, and (A) expression spherical aberration, (B) expression astigmatism, (C) represents to distort.
Figure 20 is the aberration diagram of the various aberrations of the related imaging lens system of expression embodiment 9, and (A) expression spherical aberration, (B) expression astigmatism, (C) represents to distort.
Figure 21 is the aberration diagram of the various aberrations of the related imaging lens system of expression embodiment 10, and (A) expression spherical aberration, (B) expression astigmatism, (C) represents to distort.
Figure 22 is the aberration diagram of the various aberrations of the related imaging lens system of expression embodiment 11, and (A) expression spherical aberration, (B) expression astigmatism, (C) represents to distort.
Figure 23 is the oblique view of expression as a structure example of the camara module of the related camera head of one embodiment of the present invention.
Figure 24 is the outside drawing of expression as a structure example of the mobile phone of the band video camera of the related portable terminal device of one embodiment of the present invention.
Among the figure: CG-optics, G1-the 1st lens, G2-the 2nd lens, G3-the 3rd lens, G4-the 4th lens, St-aperture diaphragm, Ri-is from the radius-of-curvature of i lens face of thing side, Di-from thing side i with i+1 lens face between the face interval, the Z1-optical axis.
Embodiment
[lens arrangement]
Below, with reference to accompanying drawing embodiments of the present invention are elaborated.
Fig. 1 represents the 1st structure example of the imaging lens system that one embodiment of the present invention is related.This structure example is corresponding to the lens arrangement of the 1st numerical value embodiment described later.Similarly, will be shown in Fig. 2～Figure 11 corresponding to the cross-section structure of the 2nd～the 11st structure example of the lens arrangement of the 2nd～the 11st numerical value embodiment described later.In Fig. 1～Figure 11, symbol Ri represent to lean on most the thing side the lens key element face as the 1st (with diaphragm St as the 0th) and along with increasing successively towards picture side (imaging side) radius-of-curvature of i face of diacritic.Symbol Di represent on the optical axis Z1 between i face and i+1 the face face at interval.
The related imaging lens system of present embodiment possesses diaphragm St, the 1st lens G1, the 2nd lens G2, the 3rd lens G3, the 4th lens G4 successively along optical axis Z1 from the thing side.
Diaphragm St is optical aperture diaphragm, preferably by on optical axis Z1 than the vertex of surface position of the picture side of the 1st lens G1 more by the configuration of thing side ground, and be configured in lens combination lean on the thing side most.At this, " by thing side " be meant except the structure example of for example Fig. 3 the situation at the vertex of surface position configuration diaphragm St of the thing side of the 1st lens G1 on the optical axis Z1, also comprise as other structure example in the situation that disposes diaphragm St between the vertex of surface position of the thing side of the 1st lens G1 and the picture vertex of surface position of side.Diaphragm St preferred disposition, for example gets final product disposing between the marginal position E (with reference to Fig. 1) at the face of the thing side of the vertex of surface position of the thing side of the 1st lens G1 and the 1st lens G1 on the optical axis by the thing side in more.
At imaging apparatuss such as the imaging surface Simg of this imaging lens system configuration CCD.The structure of the camera side of installing according to lens between the 4th lens G4 and imaging apparatus can dispose various optics CG.The shooting face that for example can dispose is protected with tabular opticses such as cover glass or infrared intercepting filter.At this moment, for example also can use as optics CG and apply the parts that infrared intercepting filter or ND optical filter etc. have the coating of filter effect at the tabular cover glass.And, in this imaging lens system, also can apply infrared intercepting filter or ND optical filter etc. and have the coating of filter effect or the coating of antireflection at all or at least 1 lens face of the 1st lens G1～the 4th lens G4.
The 1st lens G1 has positive refracting power.Preferred the 1st lens G1 is the biconvex shape near optical axis.
The 2nd lens G2 has negative refracting power.The 2nd lens G2 can be by being the plano-concave shape (for example structure example of Fig. 3) on plane or the convex surface formation such as meniscus shape (for example structure example of Fig. 4) lens of etc.ing towards the thing side for concave-concave shape (for example structure example of Fig. 1), thing side near optical axis.
Near the 3rd lens G3 its face as side optical axis is convex surface and has positive refracting power.The face of the thing side of the 3rd lens G3 for example is concave surface near optical axis.
The face of the thing side of the 4th lens G4 is being concave surface (for example structure example of Fig. 1, Fig. 2) or plane (for example structure example of Fig. 3, Fig. 4) near the optical axis and has negative refracting power near optical axis.
Preferred the 1st lens G1, the 2nd lens G2, the 3rd lens G3, the 4th lens G4 separately at least 1 bread contain aspheric surface.Especially preferred the 4th lens G4 as the face of side near the optical axis for concave shape and have along with comparing the zone that dies down towards near the negative refracting power of periphery and the optical axis.And the face as side of preferred the 4th lens G4 is the aspherical shape that has flex point in effective diameter.And preferred the 4th lens G4's is the aspherical shape that has limit in effective diameter except that optical axis center as the side.Particularly, the face of for example preferred the 4th lens G4 as side become as near optical axis towards as side be concave shape and at periphery towards being the aspheric surface of convex form as side.
At this, under the situation that especially is set as aspherical shape, the 2nd lens G2, the 3rd lens G3 and the 4th lens G4 just easily become complicated shape and shape and also become big easily under comparing with the 1st lens G1.Therefore, from processability or manufacturing cost aspect, preferred the 2nd lens G2, the 3rd lens G3 and the 4th lens G4 constitute by resin material.Preferred the 1st lens G1 also is made of resin material under the situation of paying attention to manufacturing cost.But, also the 1st lens G1 can be made of glass material in order to seek high performance.
Preferred this imaging lens system formula (1) that meets the following conditions.Wherein, R3 paraxial radius-of-curvature, the R4 of face that be made as the thing side of the 2nd lens G2 is made as the paraxial radius-of-curvature of face of the picture side of the 2nd lens G2.
0.3＜|(R4+R3)/(R4-R3)|＜1.5……(1)
And formula preferably suitably optionally meets the following conditions.Wherein, establishing f is the focal length of the 4th lens G4 for whole focal length, the focal length that f1 is the 1st lens G1, the focal length that f2 is the 2nd lens G2, focal length, the f4 that f3 is the 3rd lens G3.V1 is made as the 1st lens G1 Abbe number, the v2 of d line is made as the Abbe number of the 2nd lens G2 to the d line.
0.3＜|f4/f|＜0.80……(2)
0.4＜f1/f＜1.1……(3)
0.2＜f3/f＜1.6……(4)
0.5＜|f2/f|＜2.0……(5)
20＜v1-v2……(6)
[to the application examples of camera head]
Figure 24 (A), (B) be as an example of the related portable terminal device of present embodiment, the mobile phone of expression band video camera.And Figure 23 represents the structure example as the camara module of the related camera head of present embodiment.The mobile phone of the band video camera shown in Figure 24 (A), (B) possesses top basket 2A and bottom basket 2B, and the mode of rotating freely along the direction of arrow of Figure 24 (A) according to both constitutes.Basket 2B is provided with operating key 21 etc. in the bottom.Be provided with video camera portion 1 (Figure 24 (B)) and display part (indication mechanism) 22 (24 (A)) etc. at top basket 2A.Display part 22 is made of display panels such as LCD (liquid crystal panel) or EL (Electro-Luminescence) panels.Display part 22 is configured in the side that becomes inner face when folding.Except the various menus of relevant telephony feature show, can also show by the captured image of video camera portion 1 at this display part 22 etc.Video camera portion 1 for example is configured in the rear side of top basket 2A.But the position that image pickup part 1 is set is not limited thereto.
Video camera portion 1 has camara module for example shown in Figure 23.This camara module possesses as shown in figure 23: hold the supporting substrates 4 of lens barrel 3, the supporting lens barrel 3 of imaging lens system 20, the position set imaging apparatus (not shown) corresponding with the imaging surface of imaging lens system 20 on supporting substrates 4.And this camara module also possesses the flexible base plate 5 that is electrically connected with imaging apparatus on the supporting substrates 4 and according to the external connection terminals 6 that not only is electrically connected with flexible base plate 5 and constitutes with the signal processing circuit ways of connecting of telephone body side.These inscape one constitute.
In video camera portion 1, the optical image that is formed by imaging lens system 20 is converted into electric image pickup signal via imaging apparatus, and this image pickup signal is output to the signal processing circuit of equipment body side.As the imaging lens system in the mobile phone of this band video camera 20, use the related imaging lens system of present embodiment, thereby obtain high-resolution image pickup signal that aberration correction is fully carried out.Can generate high-resolution image according to this image pickup signal in the telephone body side.
In addition, the related imaging lens system of present embodiment can be suitable in various camera heads that used imaging apparatuss such as CCD or CMOS or portable terminal device.Camera head that present embodiment is related or portable terminal device are not limited to the mobile phone with video camera, for example also can be static video camera of number or PDA etc.
[effect, effect]
Next illustrates effect and effect as the imaging lens system of above formation.
In the related imaging lens system of present embodiment, on the whole in 4 the lens arrangement, be set as each power of lens configuration positive and negative, positive and negative successively from the thing side, and suitably set the face shape of each lens, and satisfy the predetermined condition formula, thereby help the shorteningization of length overall and can obtain high imaging performance.Especially in this imaging lens system, when being set as concave surface or plane, and become the shorteningization that helps length overall and the structure of imaging performance by near the face shape of the thing side the optical axis of the lens (the 4th lens G4) of shooting side.And the 4th lens G4 possesses negative refracting power, thereby favourable to guaranteeing rear cut-off distance.If the positive refracting power of the 4th lens G4 is strong excessively, then be difficult to guarantee sufficient rear cut-off distance.
And, in this imaging lens system, the 1st lens G1, the 2nd lens G2, the 3rd lens G3 and the 4th lens G4 separately in, use aspheric surface at least 1, thereby more help keeping of aberration performance.Especially in the 4th lens G4, compare by the visual angle beam separation with the 1st lens G1, the 2nd lens G2 and the 3rd lens G3.Therefore, by as near the last lens face of imaging apparatus promptly the face of the 4th lens G4 as side be set as near optical axis towards as side be concave shape and at periphery towards being convex form as side, thereby suitably carry out the aberration correction by the visual angle, light beam is controlled as below the certain angle to the incident angle of imaging apparatus.Thereby the light quantity that can be reduced to the whole zone of image planes is inhomogeneous, and helps the correction of curvature of the image (also claiming the curvature of field) or distortion aberration (also claiming the distortion aberration) etc.
Usually, in camera-lens system, preferred far away disposition, promptly chief ray to the incident angle of imaging apparatus with respect to optical axis approaching parallel (incident angle of shooting face with respect to the normal of shooting face near zero).In order to ensure this disposition far away, preferred diaphragm St is disposed at as far as possible by the thing side.On the other hand, if diaphragm St be disposed at from the lens face of the thing side of the 1st lens G1 more to the thing side direction away from the position, then its amount can be coupled with (diaphragm St and by the distance between the lens face of thing side) as optical path length, so unfavorable to integrally-built densification aspect.Thereby, by diaphragm St being disposed at, thereby guarantee disposition far away when can seek the shorteningization of length overall on the optical axis Z1 and the lens face vertex position same position of the thing side of the 1st lens G1 or be disposed between the vertex of surface position and the picture vertex of surface position of side of thing side of the 1st lens G1.More paying attention to the situation about guaranteeing of disposition far away, on the optical axis between the marginal position E (with reference to Fig. 1) at the face of the thing side of the vertex of surface position of the thing side of the 1st lens G1 and the 1st lens G1 configuration diaphragm St get final product.
Above-mentioned conditional (1) relates to shape and the refracting power of the 2nd lens G2.If surpass the upper limit of conditional (1), then the refracting power of the 2nd lens G2 became weak and unfavorable to the shorteningization of length overall.If be lower than the lower limit of conditional (1), then the refracting power of the 2nd lens G2 became strong and was difficult to carry out aberration correction.
Obtain higher imaging performance when shortening length overall, the numerical range of optimum condition formula (1) is as follows.
0.35＜|(R4+R3)/(R4-R3)|＜1.45……(1-1)
In order to obtain further good performance, be preferably as follows.
0.6＜|(R4+R3)/(R4-R3)|＜1.1……(1-2)
Above-mentioned conditional (2) is the formula of the focal distance f 4 of relevant the 4th lens G4, diminishes if surpass the refracting power of this numerical range and the 4th lens G4, then is difficult to carry out the shorteningization of length overall.If be lower than this numerical range, the refracting power grow of the 4th lens G4 then is for its elimination and the refracting power of the 3rd lens G3 also must be strengthened, so the outer performance degradation of axle.
In order to obtain better performance, more preferably the numerical range of conditional (2) is following scope.
0.35＜|f4/f|＜0.70……(2-1)
In order to obtain further good performance, be preferably as follows.
0.4＜|f4/f|＜0.70……(2-2)
Above-mentioned conditional (3) is the formula of the focal distance f 1 of relevant the 1st lens G1, if be lower than this numerical range, then the refracting power of the 1st lens G1 became and causes the increase of spherical aberration by force, and was difficult to guarantee rear cut-off distance.If surpass this numerical range, then be difficult to carry out the shorteningization of length overall, be difficult to carry out the correction of curvature of the image and astigmatism (also claiming astigmatism) etc.
In order to obtain better performance, more preferably the numerical range of conditional (3) is following scope.
0.45＜f1/f＜1.0……(3-1)
In order to obtain further good performance, be preferably as follows.
0.5＜f1/f＜0.9……(3-2)
Above-mentioned conditional (4) is the formula of the focal distance f 3 of relevant the 3rd lens G3, and the positive refracting power of the 3rd lens G3 became strong if be lower than this numerical range, and then performance degradation also is difficult to guarantee rear cut-off distance.If surpass this numerical range, then positive refracting power became weak and was difficult to carry out sufficient aberration correction.
In order to obtain better performance, more preferably the numerical range of conditional (4) is following scope.
0.3＜f3/f＜1.5……(4-1)
In order to obtain further good performance, be preferably as follows.
0.35＜f3/f＜1.1……(4-2)
Above-mentioned conditional (5) is the formula of the focal distance f 2 of relevant the 2nd lens G2, if be lower than this numerical range, then the refracting power of the 2nd lens G2 became strong and the aberration increase.If surpass this numerical range, then refracting power became weak and was difficult to carry out the correction of curvature of the image and astigmatism etc.
In order to obtain better performance, more preferably the numerical range of conditional (5) is following scope.
0.8＜|f2/f|＜1.9……(5-1)
In order to obtain further good performance, be preferably as follows.
0.9＜|f2/f|＜1.8……(5-2)
Above-mentioned conditional (6) is the formula of the chromatic dispersion of regulation the 1st lens G1 and the 2nd lens G2, can seek the reduction of a last chromatic aberation by satisfying this numerical range.
In order to obtain better performance, more preferably the numerical range of conditional (6) is following scope.
25＜v1-v2＜40……(6-1)
In order to obtain further good performance, be preferably as follows.
28＜v1-v2＜32……(6-2)
Imaging lens system as described above, related according to present embodiment is realized high imaging performance when can realize the shorteningization of length overall.And, camera head or the portable terminal device related according to present embodiment, according to will be by the shorteningization of length overall and have the mode that the pairing image pickup signal of optical image that the imaging lens system of high imaging performance forms exports and constitute, so can seek miniaturization as device or equipment integral.And, obtain high-resolution image pickup signal and just can obtain high-resolution photographs according to this image pickup signal.
[embodiment]
Secondly, the concrete numerical value embodiment to the related imaging lens system of present embodiment describes.Following, a plurality of numerical value embodiment are partly concluded describe.
[numerical value embodiment 1]
The pairing concrete lens data of structure of the imaging lens system that [table 1], [table 2] expression is shown in Figure 1.Especially its basic lens data of expression in [table 1] is represented aspherical surface data in [table 2].Shown in the hurdle of face number Si in the lens data shown in [table 1]: the face of textural element that relevant embodiment 1 related imaging lens system will lean on the thing side most as the 1st along with number towards the face of i (i=1～10) of addition number as side increases successively.In radius of curvature R i hurdle, expression is corresponding to symbol Ri additional in Fig. 1, from the value (mm) of the radius-of-curvature of i face of thing side.About the hurdle of face interval D i, represent the interval (mm) from the optical axis between i face Si of thing side and i+1 the face Si+1 similarly.In the hurdle of Ndj and vdj, represent from j optical parameter of thing side the refractive index of d line (587.6nm) and the value of Abbe number.At [table 1] marge as the focal distance f (mm) of various data representation total systems, the value of F number (FNo.).
In the related imaging lens system of this embodiment 1, the two-sided aspherical shape that all becomes of the 1st lens G1～the 4th lens G4.In the basic lens data of [table 1], relevant aspheric radius-of-curvature is shown with near the radius-of-curvature the optical axis.
Aspherical surface data at the related imaging lens system of [table 3] expression embodiment 1.In the numerical value shown in the aspherical surface data, mark " E " represents that the data after it are the end " power exponent " with 10, and expression is that the numerical value that the exponential function at the end is represented is taken advantage of the numerical value before in " E " with this by 10.For example, if " 1.0E-02 ", then expression " 1.0 * 10-2 ".
As aspherical surface data, record is by the value of each coefficient Ai, K in the formula of the aspherical shape of following formula (A) expression.More specifically, Z represents to have the length (mm) of vertical line that point on the locational aspheric surface of height h hangs down into the section (perpendicular to the plane of optical axis) on aspheric summit from the distance optical axis.
Z＝C·h
2/{1+(1-K·C
2·h
2)
1/2}+∑A
i·h
i……(A)
Wherein,
Z is the aspheric degree of depth (mm)
H be from the optical axis to the lens face distance (highly) (mm)
K is an eccentricity
C is paraxial curvature=1/R
(R is paraxial radius-of-curvature)
∑ A
iH
iBe the A when the i=3～n
iH
iSummation (n=3 above integer)
A
iIt is the i time asphericity coefficient.
The aspheric surface of the imaging lens system that embodiment 1 is related is according to above-mentioned aspheric surface formula (A), for asphericity coefficient A
nEffectively utilize A
3～A
10Till number of times represent.
[table 1]
(f＝4.783mm，FNo.＝2.80)
[table 2]
[numerical value embodiment 2～11]
Identical with above numerical value embodiment 1, the concrete lens data corresponding with the structure of imaging lens system shown in Figure 2 is shown in [table 3], [table 4] as numerical value embodiment 2.In the same manner, the concrete lens data corresponding with the structure of each imaging lens system of Fig. 3～shown in Figure 11 is shown in [table 5]～[table 22] as numerical value embodiment 3～11.In these embodiment 2～11, identical with the imaging lens system of embodiment 1, the two-sided aspherical shape that all becomes of the 1st lens G1～the 4th lens G4.
[table 3]
(f＝5.141mm，FNo.＝2.80)
[table 4]
[table 5]
(f＝4.604mm，FNo.＝2.80)
[table 6]
[table 7]
(f＝5.397mm，FNo.＝2.80)
[table 8]
[table 9]
(f＝4.700mm，FNo.＝2.80)
[table 10]
[table 11]
(f＝4.703mm，FNo.＝2.80)
[table 12]
[table 13]
(f＝4.654mm，FNo.＝2.80)
[table 14]
[table 15]
(f＝5.305mm，FNo.＝2.80)
[table 16]
[table 17]
(f＝5.139mm，FNo.＝2.80)
[table 18]
[table 19]
(f＝4.925mm，FNo.＝2.80)
[table 20]
[table 21]
(f＝4.923mm，FNo.＝2.80)
[table 22]
[other numeric datas of each embodiment]
In [table 23] expression with the value of relevant above-mentioned each conditional value to each embodiment conclusion.From [table 23] as can be known, for each conditional, the value of each embodiment is in its numerical range.
[table 23]
The conditional guide look
| Conditional (1) | (R4+R3)/(R4-R3) | | Conditional (2) | f4/f| | Conditional (3) f1/f | Conditional (4) f3/f | Conditional (5) | f2/f| | Conditional (6) v1-v2 | |
| Embodiment 1 | 0.992 | 0.487 | 0.672 | 0.530 | 1.149 | 31.3 |
| Embodiment 2 | 0.699 | 0.587 | 0.534 | 0.802 | 0.957 | 31.1 |
| |
1.000 | 0.417 | 0.661 | 0.421 | 1.050 | 31.1 |
| |
1.441 | 0.452 | 0.823 | 0.521 | 1.712 | 30.6 |
| |
0.821 | 0.521 | 0.675 | 0.618 | 1.101 | 29.5 |
| |
0.761 | 0.520 | 0.671 | 0.617 | 1.096 | 29.5 |
| Embodiment 7 | 0.985 | 0.516 | 0.650 | 0.618 | 1.098 | 29.5 |
| Embodiment 8 | 0.999 | 0.427 | 0.684 | 0.445 | 1.086 | 30.6 |
| Embodiment 9 | 0.364 | 0.668 | 0.520 | 1.022 | 0.943 | 31.1 |
| Embodiment 10 | 0.609 | 0.650 | 0.550 | 0.938 | 0.987 | 31.1 |
| Embodiment 11 | 0.491 | 0.663 | 0.538 | 0.983 | 0.977 | 31.1 |
[aberration performance]
Figure 12 (A)～(C) represents spherical aberration, astigmatism and the distortion (distortion aberration) of the imaging lens system that numerical value embodiment 1 is related respectively.In each aberration diagram, expression is the aberration of reference wavelength with d line (587.6nm).In spherical aberration diagram, also represent aberration to g line (wavelength 435.8nm), C line (656.3nm).In astigmatism figure, solid line is represented the aberration of sagitta of arc direction, and dotted line is represented the aberration of meridian direction.FNo. represent the F value, ω represents half angle of view.
In the same manner, the various aberrations of the imaging lens system that relevant numerical value embodiment 2 is related are shown in Figure 13 (A)～(C).Similarly, the various aberrations of the imaging lens system that relevant numerical value embodiment 3～11 is related are shown in (A)～(C) of Figure 14～Figure 22.
From each above numeric data and each aberration diagram as can be known, can realize the shorteningization of length overall and realize high imaging performance for each embodiment.
In addition, this explanation is not limited to above-mentioned embodiment and each embodiment, can carry out various distortion and implement.For example, the value of the radius-of-curvature of each lens composition, face interval and refractive index etc. is not limited to by the value shown in above-mentioned each numerical value embodiment, can get other value.
Claims (12)
1. an imaging lens system is characterized in that, possesses successively from the thing side:
The 1st lens have positive refracting power;
The 2nd lens have negative refracting power;
The 3rd lens have positive refracting power;
The 4th lens, the face of thing side are concave surface or plane near optical axis, and have negative refracting power near optical axis,
And formula meets the following conditions:
0.3＜|(R4+R3)/(R4-R3)|＜1.5……(1)
Wherein,
R3: the paraxial radius-of-curvature of the face of the thing side of the 2nd lens,
R4: the paraxial radius-of-curvature of the face of the picture side of the 2nd lens.
2. imaging lens system as claimed in claim 1 is characterized in that,
Formula also meets the following conditions:
0.3＜|f4/f|＜0.80……(2)
Wherein,
F: whole focal length,
F4: the focal length of the 4th lens.
3. imaging lens system as claimed in claim 1 or 2 is characterized in that,
Formula also meets the following conditions:
0.4＜f1/f＜1.1……(3)
Wherein,
F1: the focal length of the 1st lens.
4. imaging lens system as claimed in claim 1 or 2 is characterized in that,
Formula also meets the following conditions:
0.2＜f3/f＜1.6……(4)
Wherein,
F3: the focal length of the 3rd lens.
5. imaging lens system as claimed in claim 1 or 2 is characterized in that,
Formula also meets the following conditions:
0.5＜|f2/f|＜2.0……(5)
Wherein,
F2: the focal length of the 2nd lens.
6. imaging lens system as claimed in claim 1 or 2 is characterized in that,
Formula also meets the following conditions:
20＜v1-v2……(6)
Wherein,
V1: the 1st lens are to the Abbe number of d line,
V2: the 2nd lens are to the Abbe number of d line.
7. imaging lens system as claimed in claim 1 or 2 is characterized in that,
The vertex of surface position as side than described the 1st lens on optical axis more disposes diaphragm by the thing side.
8. imaging lens system as claimed in claim 1 or 2 is characterized in that,
Described the 4th lens as the face of side near the optical axis for concave shape and have along with comparing the zone that dies down towards near the negative refracting power of periphery and the optical axis.
9. imaging lens system as claimed in claim 8 is characterized in that,
The face as side of described the 4th lens is the aspherical shape that have flex point in effective diameter.
10. imaging lens system as claimed in claim 8 is characterized in that,
The face as side of described the 4th lens is the aspherical shape that have limit in effective diameter except that optical axis center.
11. a camera head is characterized in that possessing:
Any imaging lens system of being put down in writing in the claim 1 to 10; With
Imaging apparatus with the pairing image pickup signal output of the optical image of described imaging lens system formation.
12. a portable terminal device is characterized in that possessing:
The camera head that claim 11 is put down in writing; With
The indication mechanism that the captured image of described camera head is shown.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010101150A JP5535747B2 (en) | 2010-04-26 | 2010-04-26 | IMAGING LENS, IMAGING DEVICE, AND PORTABLE TERMINAL DEVICE |
| JP2010-101150 | 2010-04-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201765373U true CN201765373U (en) | 2011-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202453037U Expired - Lifetime CN201765373U (en) | 2010-04-26 | 2010-06-28 | Pickup lens and pickup device as well as convenient terminal unit |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20110261471A1 (en) |
| JP (1) | JP5535747B2 (en) |
| CN (1) | CN201765373U (en) |
| TW (1) | TWM394465U (en) |
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| CN103913816A (en) * | 2013-11-29 | 2014-07-09 | 玉晶光电(厦门)有限公司 | Portable electronic device and optical imaging lens thereof |
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- 2010-06-18 TW TW099211630U patent/TWM394465U/en not_active IP Right Cessation
- 2010-06-28 CN CN2010202453037U patent/CN201765373U/en not_active Expired - Lifetime
-
2011
- 2011-04-26 US US13/094,337 patent/US20110261471A1/en not_active Abandoned
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Also Published As
| Publication number | Publication date |
|---|---|
| US20110261471A1 (en) | 2011-10-27 |
| JP5535747B2 (en) | 2014-07-02 |
| TWM394465U (en) | 2010-12-11 |
| JP2011232449A (en) | 2011-11-17 |
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